Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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How to power PCA9685

I am using the RP 4B and am trying to control a servo with the PCA9685. Unfortunatelly I am very new to all that and therefore I don't know which specific components I need to power it up. I bought a ...
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1answer
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Can USB ports blow polyfuse on Raspberry Pi 3B?

I suspect my RPi 3b polyfuse to be blown, but I don't know what's causing it. I'm using an external HDD for booting into DietPi with its own power supply and after every day or so all the USB ports ...
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Does Raspberry Pi 3B have polyfuse? Can USB ports blow polyfuse? [duplicate]

Does Raspberry Pi 3b have polyfuse? If it does, under what conditions can it be 'blown'? I suspect my RPi 3b polyfuse to be blown, but I don't know what's causing it. I'm using an external HDD for ...
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No power to usb ports on raspberry pi 3B

I use external harddisk(connected via USB with its own power supply) to boot into dietpi on my raspberry pi. It works okay for a day(even with multiple reboots and poweroff). But the next day RPi ...
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3answers
38 views

Performance of the Rasperris

The Raspberry pi 4 has a power supply that can deliver a maximum of 15.5 watts. How much power exactly does the Raspberry use without overclocking at maximum power so that I can connect the ...
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1answer
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Is there any way to connect external graphics cards to the Rasperri?

I would like to connect graphics cards to my Rasperri, for example an rx 580. I can also buy an external power supply unit to supply it with power. So is it somehow possible that the Rasperi works ...
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4answers
80 views

Temperature, Humidity and Weight monitoring for beehives using Raspberry Pi Zero [closed]

I'm new about Raspberry world.. I'm studying a way to implement a custom beehive monitoring system. I would like to make a premise: I'm studying to organize the project, I'm not yet implementing or ...
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58 views

RPi4 won't power on from 5V if any load is present on 3V3

The short version: Raspberry Pi 4B, rev 1.1, doesn't turn on when provided with 5V on the pins 2&4 if any load is present on the 3V3 (pins 1&17). However, powering the Pi from a USB-C source (...
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2answers
52 views

How to schedule the power on / power off of a Raspberry

What are the solutions to locally schedule the power on / power off of a Raspberry (power on at 8 am and power off at 8 pm) ? I was asked to do so by the person in charge of my project. I told him it ...
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Power RPi4 only from GPIO pins (disable USB-C power input)

I am using the USB-C/power port of an RPi4 in "gadget mode" (acting as USB Mass Storage Device connected to 3rd party instrument that logs measurements to it). However, that USB connection ...
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Raspberry Pi dead? Heating up, high pitched noise + no power to USB

It looks like my Rpi is dying, but I'm hoping I can still save it somehow. It's a Pi 3 B+ that I've used for the past year or so on and off, mostly to drive a NeoPixel strip. A few days ago the strip ...
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1answer
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Power Requirements for a Raspberry Pi 4B 8GB and Peripherals

I want to build a Raspberry Pi setup plus peripherals, but I'm not sure if the power adapter I've chosen will be enough to supply power to everything sufficiently. The following would be the complete ...
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Turn of LAN Controller on Raspberry Pi 4 for power savings

I have a need for two UART ports with ~115200 bps capability without using the USB port due to which I'm forced to use the Raspberry Pi 4 with its multiple UARTs. My other problem is I'm trying to ...
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2answers
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How voltage tolerant is the RPi 3 A+ micro-B USB power connection? [duplicate]

I've been reading about power supply requirements for RPi and want to learn more about the practical limits in addition to the design limits. What is the power protection circuit (if any) on the micro-...
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Boot Pi4 using GPIO of Pi0

I am trying using Pi Zero GPIO and optocoupler to Power On(boot) my Pi4. My Pi4 is shutdown with terminal command(It is connected with power). My schematic set up: My Python code: #!/usr/bin/env ...
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pi 4 - Power present

I am using a pi4 and pijuice. Is it possible with a script or python to check if power is present in my Pi4?(usb port) I am using my pi4 headless with as a web server(online). I would like to know ...
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Debugging wifi disconnects

I'm trying to debug why my GoPro disconnects from my Raspberry Pi's wifi in AP mode. It seems that the GoPro is rather sensitive to network conditions, so if there's any weak signal, it will drop the ...
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How can I use a computer to control a wired / wireless PWM controller to control the speed of a dc motor

How can I use a computer to control a wired / wireless PWM controller to control the speed of a dc motor (I will be testing both wired and wireless to test response) I have a DC motor 6-12v mini DC ...
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1answer
49 views

Energy consumption raspberry pi 2B

I would like to calculate the energy consumption of a given process in a Raspberry Pi 2B Rev.1.1 BCM2836. It is fed using the microusb port through a laptop docker via USB. I'm using atop to get the ...
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1answer
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Cron job not working on python script for power monitoring - HS110

I have cobbled together a script which runs as a standalone python file. It successfully connects to the HS110 smart plug from Kasa/TPLINK and posts the power in Watts to my webserver. This all works. ...
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1answer
47 views

What power supply can I use for 2 servos?

I am a complete noob when it comes to raspberry. I have 2 servos MG996R that I need to power from an external power supply. Currently I am doing it from the board, and when I turn both of them the ...
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2answers
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raspberry pi 4 suddenly won't recognize nvme on USB3 port

I'm running ubuntu 20.10 arm64 on Raspberry Pi 4b. I was booting from a western digital NVMe drive in a USB-to-NVMe adapter/enclosure thing attached to the USB3 port. This has been working fine for ...
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how to power a raspberry pi zero w, with a 2x18650 bay, through GPIO

I'd like to wire this bay to the GPIOs of a rpi zero w. The bay welcomes 2S 2x18,650. On each cell is written "9800mAh TR 18650 3.7v Li-ion". My requirements are : One micro-USB port must ...
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2answers
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How many would cost to mainain the raspberry pi powered on 365 days a year, 24hrs a day? [closed]

Does someone know what would it be the medium cost on the electricity bill of having the raspberry pi 4 switched on on almost every moment of the year? I have listened that the cost of the raspberry ...
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1answer
43 views

Can I force my Pi (4B) to boot attached mechanical drives **after** one another, instead of simultaneously?

I'm still trying to workaround to attach multiple 3.5 HDDs on my Raspberry Pi 4B without a centralised hub. Everytime my Raspi Boots, or boots up the drives, it does so with booting all of them at ...
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226 views

Pico power management in micropython

I have one of those new Pi Picos, and as I understand great power savings can be had by putting the pico into sleep mode. I can see from the CPU spec sheet that this is possible, however I can't find ...
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1answer
594 views

Did I just fry my Raspberry Pi Pico?

So, I recently bought a Rpi Pico and tried to make a Bluetooth remote control out from it. What I did: I used an HC-05 Bluetooth module (require 3.3V), 3 momentary button switch (powered from GPIO pin)...
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3answers
102 views

Use a usb-c charger with variable voltage for charging Pi4 [duplicate]

I have read here that is possible to charge you pi4 with 3rd party chargers that supply 5V 3A. I am wondering if I can use this 20W charger, which can deliver differnet voltage level (5V/3A, 9V/2A, ...
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1answer
18 views

go to bed alarm with RP, problems with power off

I have a Raspberry Pie 2 that I want to use to light LEDs behind my monitor if I should be sleeping instead of staying on the Internet. For this I will use a autostarting python script, but I don't ...
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1answer
33 views

setting raspberry pi zero to automatically power on after power failure

I'm planning to buy a Raspberry Pi Zero W to remotelly wake on my desktop pc. To do this task I need that the raspberry always stays awake; is there a way to set the raspberry automatically wake on ...
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1answer
278 views

Raspberry Pi 4 - Booting with 3 USB attached Harddrives causes Crashing

I use my Raspberry mainly as a fileserver. I've attached 3 harddrives, 1 of them being an SDD and 2 Mechanical 3.5 Drives. When powered on, everything seems to work. However, when booting, the initial ...
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1answer
44 views

Is there a way to use the USB-C port as power and for something else?

What I mean by something else I mean connecting my external ssd (uses usb-c) to my pi rather than the usb ports as those are slower. I have read on usb-c Port of RasPi 4 used for anything else but ...
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6answers
63 views

Could a USB-powered Raspberry Pi emulate a NO momentary switch (PC front panel SW signal) using its GPIO pins without causing damage?

I am trying to use a Raspberry Pi's GPIO pins in conjunction with a normal ATX motherboard's I/O pins (particularly the "power SW" pair) to trigger boot on the PC as though the Pi were a ...
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1answer
133 views

Unable to detect NVMe M.2 ssd in raspberry pi 4 8gb

Is it possible to use an NVMe M.2 as external storage on a Pi4b 8GB? I have the following PCIe device: samsung NVMe PCIe 3.0 SSD 970 Evo plus, 500 gb + external hard drive enclosure with a C to A ...
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Raspberry Pi seemed to have rebooted

I let my RPi on yesterday with several scripts open and running. But when I came back today, all the scripts were closed, like if the RPI rebooted. I read that Raspbian, contrary to Windows, is not ...
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3answers
57 views

Is it okay to use my Raspberry pi3 in low power?

My raspberry always flashes the lightning icon and there's a warning a saying that. Is it okay to use my Raspberry pi on that condition? Can it damage the raspberry? I don't have an official power ...
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CM4 eMMC - safe shutdown / power supply schemes

I'm working on a design that uses a CM4 with eMMC and may (optionally) use an external SD card or USB stick for "user" file storage. The unit could (potentially) be hard powered-down by the ...
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1answer
92 views

Fried my gpio pins?

I might have fried my gpio pins. I have a pie 3b with Hyperion installed and I’m trying to use it to run a set of ws2812 led lights. The led lights are running off of a 5v 8amp power supply and the pi ...
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136 views

RPI connected to a smart plug -> how to auto turn off plug after RPI shutdown?

In short: I was wondering if it is possible to send a command to a smart plug when the pi is good to kill it's power. background I'm running a 3d printer which I'm going to control with a rpi 4 using ...
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0answers
46 views

Change the CPU Core Voltage from terminal

I was wondering if anyone is aware of how I can change the CPU Core Voltage of a Raspberry pi using system calls from the terminal. I know that we can do this by setting the over_voltage parameter in /...
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0answers
59 views

NEO-6M GPS Module Not Working

I have an RS232 NEO-6M GPS module connected to my Raspberry Pi. The board I have requires power, ground, TX and RX. Power and ground are connected to my Raspberry Pi's GPIO pins (+5V and GND), and the ...
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3answers
828 views

Connecting to a raspberry pi 4 using a docking station?

I've just purchased the Pi 4 model B and am buying the parts I need. I have a docking station I usually use for my laptop and was wondering if the Pi can be fully set up using a docking station via ...
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3answers
235 views

Low voltage on raspberry pi?

I have an old charger from my RP3 using in RP4 with micro-usb -> usb-C cap on it. I have a feeling that my Pi has not enough power- When I start Pi with fan connected to pins, it makes sounds like ...
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Total USB current output is 1.2A, if I power a device from the 5V GPIO port, does this decrease the USB output?

I'm trying to connect 2x 2.5" external HD using a USB to SATA converted. I found out the maximum current the Pi can provide is 1.2A for all usb ports, however I need 2A I'm wondering if I can use ...
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3answers
79 views

Use GPIO to power an USB device

I searched the forum but didn't get a clear answer. I have a "LED tinsel" powered by an USB plug. I tried connecting a 5V pin of my RasPi3 GPIO to the "+" pin of the USB plug, and ...
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1answer
148 views

Powering Raspberry Pi 4 'on the move' using power bank [closed]

There are good official resources that state that recommended power supply must be 3 amps (e.g. official RPi power supply via mains). However, for use 'on the move' or remote locations this may not be ...
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0answers
22 views

How to properly power my Raspberry Pi 4 Model B [duplicate]

What's my best alternative to power my raspberry? Can I plug it into a USB socket in my main PC? Can I plug it in in a socket like I was charging a phone?
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1answer
123 views

Monitor the power consumption in real-time (in Ampere or Watt)

I'd like to monitor in real-time the power consumption of a RPi. (0.5A, 1A, 2A, etc.) I know this can be done with a multimeter in ammeter mode in series, but I thought maybe there is an easier method,...
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3answers
419 views

How to power Rpi4 cluster?

Although I did some research I will still ask, maybe somebody come up with something new. I have 9 node Rpi4B+ cluster Under load I have noticed that some nodes start getting Under-voltage errors. At ...
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2answers
116 views

Driving an 800mA doorbell from the 5V of a Model B+

I want to make following schematic to feed and detect a doorbell ring. I have measured the max current through the doorbell to be 800mA. The Pi is fed with a 2.5A Raspberry power supply. GPIO3 would ...

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